Drill



p 1934- H. c. NORLEY 1,974,540

DRILL Filed Jan. 13, 1934 H. C. NOIZLEY Attorncq Patented Sept. 25, 1934 DRILL Harry Charles N orley,

North Bay, Ontario,

Canada, assignor to Canadian Atlas Steels Limited, Welland, Ontario, Canada, a company of Canada Application January 13, 1934, Serial No. 706,455

8 Claims.

My invention relates to improvements in drills, particularly intended for use in rock drilling and of the detachable bit type, and the object of the invention is to devise a drill in which the bit can be readily and quickly attached to and detached from the shank without the necessity of employing other than the ordinary tools usually at the hand of the miner.

A further object is to construct such a drill in which the connection between the bit and the shank will be a rigid and positive one and there will be no liability of the bit becoming inadvertently detached and being left in the hole bored when withdrawing the drill therefrom.

A still further object is to devise a detachable connection between bit and shank characterized by there being no slackness or play between these two parts so that rotative movement imparted to the shank will be positively transmitted to the connected bit.

With the above and other objects in view which will hereinafter appear, my invention consists, in its preferred embodiment, of the construction and arrangement all as hereinafter more particularly described and illustrated in the accompanying drawing in which:-

Fig. 1 represents a side view of the drill showing the shank and bit detached from each other.

Fig. 2 is a similar view taken at right angles to Fig. 1, the bit being shown in section.

Fig. 3 is a plan view of the bit.

Fig. 4 is an inverted plan view of the bit engaging end of the shank.

Fig. 5 is a side view of the shank, showing it in the initial position it assumes in connecting it to the bit, the latter being shown in section, and

Fig. 6 is a side view of the drill showing the shank and bit in the connected position, the bit being illust ated in section.

Like characters of reference indicate corresponding parts in the different views.

My shank 1 preferably comprises a bit engaging end 2 tapering towards its extremity, the crosssection of the tapered end being of generally elliptical form with two opposed fiat surfaces (clearly illustrated in Fig. 4).

A lateral projection 3 protrudes outwardly from the periphery of the tapered shank end 2, and preferably diametrically opposite to such projection a protuberance 4 protrudes outwardly from such periphery. As will be seen from the draw ing the protuberance 4 is not so pronounced as the projection 3. Both projection and protuberance may be located in close proximity to the extremity of the bit engaging end 2 and on the rounded portions of the periphery thereof. The peripheral edge of such extremity may be suitably rounded.

My detachable bit 5 with cutters 6 is provided with a shank receiving socket 7 extending down from its top, said socket wall being substantially correspondingly tapered to the taper of the bit engaging end of the shank and of such dimensions that when the shank end is fully received into the socket it will be a driving fit therein.

A lateral orifice 8 extends from the outer periphery of the bit through the wall of the socket 7 and is adapted to receive the projection 3 when the shank end is inserted into the socket, and the orifice 8 is preferably of greater height than the height of the projection so as to permit vertical movement of the projection therein when the shank is driven down into the socket. This orifice may well be circular and the cross-section of the projection elliptical (see Fig. 2).

A similar orifice 9 is provided through the wall of the socket 7 diametrically opposite the orifice 8 and both may conceivably be of the same size as would occur if the bit were drilled transversely. Such orifice 9 is adapted to receive the protuberance 4 and is of such size relatively thereto that the latter will be permitted a certain amount of longitudinal movement therein in driving home the shank into the socket.

The lip of the socket 7 may be rounded as illustrated to facilitate the insertion of the shank as hereinafter described.

In applying the bit-to the shank it is disposed so that its longitudinal axis is at an angle to the longitudinal axis of the shank and the bit engaging end 2 of the latter is inserted into the socket 7, the projection 3 being hooked or partially inserted into the orifice 8 (see Fig. 5). Then by swinging the bit relatively to the shank or vice versa until these two parts become disposed so that their longitudinal axes are coincident, the bit engaging end of the shank will be fully received into the socket with the projection 3 and protuberance 4 disposed respectively in the orifices 8 and 9. Finally by moving either part relatively to the other longitudinally a wedging action ensues between the tapered shank end and the tapered socket thus constituting a positive and firm connection between these two parts with the result that the bit will be positively rotated as the shank is rotated. v

Owing to the connection between the shank and the bit being of necessity a very tight one, it will be apparent that the operation of swinging the bit relatively to the shank and finally moving the two parts longitudinally would be achieved by tapping or hammering the bit onto the shank or vice versa, as would likewise be the operation of removing the same therefrom which 5 is carried out the reverse way to which it is attached.

In the drilling operation, in driving the hole to be bored. there is no tendency forv the bit to become disconnected from the shank but in withdrawing the drill from the hole such tendency very marked in detachable bit drills and this the connection as being in the bit and the male;

part on the shank, it is obvious that these two parts might be reversedly disposed.

What Iclaim as my invention is:- v

1, In a drill, the combination with a shank portion and a detachable bit portion, of a nonrotative connection between the two portions comprising a tongue on one portion inserted into a socket in the other portion, said tongue and socket coacting with each other and so formed that relative rotative movement therebetween is prevented, a lateral projection on the tongue insertable into an orifice in the socket wall, said tongue portion being initiallyapplied to the socket portion with their longitudinal axes at an angle toeach other and the lateral projection partially engaged in the orifice and such tongue portion being then swung relatively to the socket portion until the longitudinal axes of the por-' tions are coincident wherein the lateral projection fully enters the orifice and constitutes means for preventing displacement of the bit portion from the shank portion.

2. In a drill as claimed in claim 1 wherein the orifice is of such size as to permit vertical movement of the projection therein upon the shank and bit portions being subsequently driven together.

3. Ina drill, the combination with a shank portion and a detachable bit portion, of a nonrotative connection between the two portions comprising a tongue on the shank portion inserted into a socket in the detachable bit portion, said tongue and socket coacting witheach other and so formed that relative rotative movement therebetween is prevented, a lateral projection on the shank adapted to be partially inserted into an orifice in the socket wall upon the shank being applied to the bit portion with its longitudinal axis at an angle to the longitudinal axis thereof, and 'said lateral projection fully entering the orifice upon-the shank being swung so that "its longitudinal axis is coincident with the longitudinal axis'of' the bit.

4. Ina drill as claimed in claim 3 wherein the orifice in the socket wall is of such size as to permit vertical movement of the projection therein upon the shank and bitportions being subsequentlydriventogethr. v

5. In a drill as claimed in claim 3 wher ski the shank portion has opposed flattened facesand the socket wall has correspondingly opposed fiat-- te'iied faces ada'ptedto coact therewith upon the lOO shank portion being applied to the bit portion.

6. In' a drill claimed in claim 3'wherein the tongue on the shank is tapered and adapted to coa'ct with the socket in the detachable bit which is correspondingly tapered, a wedge action con nection between the shank and bit being thereby constituted. v

"I. In a drill as claimed in claim 3 wherein the socket wall has an additional orifice therein, and

a protuberance on the shank adapted to enter said orifice upon the shank and bit portions being applied to each other with their longitudinal axes coincident. v

8. In a drill as claimed-in claim "3 wherein the socket wall has an additional orifice therein, and a protuberance on 'the shank adapted to enter said orifice upon the shank and bit portions being applied to each other with their longitudinal axes coincident, said projection and said 'pro tuberance on the shank being diametrically op- 126 posed to each other and-the two orifices in the wall of the socket being diametrically opposed to each other.

HARRY CHARLES NORLEY. 

